docs: def keys_to_string(data):
      """
      Function to convert all the unicode keys in string keys
      """
      if isinstance(data, dict):
          for key in list(data.keys()):
              if isinstance(key, six.string_types):
                  value = data[key]
                  val = keys_to_string(value)
                  del data[key]
                  data[key.encode("utf8", "ignore")] = val
      return data